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You flip a fair coin 4 times. How many possible outcomes are there? (how big is the sample space?) What is the probability you get

You flip a fair coin 4 times.
1. How many possible outcomes are there? (how big is the sample space?)
2. What is the probability you get at least 1 tails?
3. What is the probability you get at least 2 tails?
4. BONUS: How many times do you have to flip a fair coin for there to be a 99% chance you've gotten at least one tails?

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